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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83415c0aa3166a22e468b86edb745f299c22bebcc8d59d422b5acbf5bee8b98e' 
  AND token = 'PTUPVfGX8x5NrlCKP2hmoCQaZ3da2iD1ZF1a55ek0Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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