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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '766bbfeb7d61742efcbe0b2c14a8be9c083223bd8d5f1c224203ead4c8604007' 
  AND token = 'kNkGTff7ijq8+dKNl+Cz86knvBcL9IyqvsRAz2+NcEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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