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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c03b670776eeca4c8359f645d344ed7d3fb912da39f0b51445e5bfa66eedc1d5' 
  AND token = '3o822gBe5nILNpietiRR+Pyzad9sbywIC4F2YanlAbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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