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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd31fe2ba7a2cfc190e0c14ea76a1f69a65f26442d17d8c5ecd0133a5fa84552' 
  AND token = 'Kf3WlgnqECf1LD1lfwkit1v5eADiAuHuHOcgD2i5whw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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