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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45c613f00a894aad1e8bf682d2597773a94a425445992db670e223fd321b70d6' 
  AND token = 'T77qhNcSF4424uLoFZf1JKoDiRHp8FmaYOeG6RIpu6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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