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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59e596059a327f694c09d16ce6e59d6982c20089476f97847a3c8f7b414ed88c' 
  AND token = 'jxl0iy64HnSYMyEf2LSqsiEiLMOkqgnNH+Xrd0z31Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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