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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33077e44f6228a88184567c81fc2331569acedd9eba89dbb1397f220457a6e66' 
  AND token = '/kAZ1cUAVX78nMXPqHLBWdHRZp2wP9b8ssn05U7S51c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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