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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fc3a2ec7f2d51a1fb41e53810c8c0796a902303dca97790529100bf1392a4f0' 
  AND token = 'ewpsWhX677rNT1gnkp9ahLTMBx2E7FGKATUhWP43NLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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