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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93b3e0262bf3cda911fcad5f7f7e9fe1ecde8832c8b1c1cd83a5b071a9f93653' 
  AND token = 'h692rqliASK3cpMOPdNWuBi++AeS1TkoSRR1TwvF64o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}