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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0fb87b0225b5328aad7b71f7dfb2434032ca89e2e0a062a2a5d3460975f32ad' 
  AND token = 'g4WV/L6t1+cmSOW2NLWjkKs1CKjbWT/1/9JGdwwygNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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