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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75caad1df7759b5d5e5e9acc2ba50b856246eacc147e58bfd2fc5c24d46702a7' 
  AND token = 'boZUsJ+knAAgHrQolxLc54ExAtMIEv286q2b7yP9GHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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