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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34a7cfb07e19fab3a3f4f7fb0c1fa70ac3594e9887e82700adf9187c1d2fe958' 
  AND token = '5/CMmkdBzFtHjPdL3JP7S2N3E5g6KDmYh5O3In8lHB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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