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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44e2c6804bf8bab5b04350e9cb24e26abab075579bb1b10a978e577aa30a30a6' 
  AND token = 'vVHjOKDInh+VO4x+WH+vO5Kyj1Lq4LLM51aNgz7R7Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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