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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2c515086e7a8a0d598bc134d19bbb3b9812355d7278f9ae70e143863575bca7' 
  AND token = '+0V00Yu9jurVRXYyZ5e2Z100nkgNpqRbkDhpEusGkDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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