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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '069981b1f81935c0f97eaf4a70e7b35be4b5ba11edd7b0081905fa982314aee9' 
  AND token = '+mC7PZ8rc7MbGRE/ZoudWzToE2yRWg81mokmiVE0mR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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