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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b62e1db5f86f3d7cc4da96ad579002717ebba0913fa90590943a90ac104cb6bd' 
  AND token = '/GRXcaRHhKdGLMx1jhle7DmAiAAB7hlrGHX8jjlYF18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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