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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f745ba98b8bf505404ec22d1add5397573f22b0904ec57dc06e57c114d9969b8' 
  AND token = 'P7oqkerDzRJC38coj8dXDc8wMo9GKUzER7aThef3r0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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